For a limited time, when you buy the full home theater package for $329.99, the retailer will throw in a free wireless speaker as part of the package. The offer allows you to choose between the SANS300 (MSRP: $99.99) and SANS400 (MSRP: $199.99).

Both of those wireless speakers are part of Sony’s HomeShare family, promising 360 degrees of sound without wires. Designed to stream music from a phone, computer, iPhone or other networked device, both models have a PartyStream feature that allows you to sync other HomeShare speakers to simultaneously play the same song or even a service like Pandora.

To get that free speaker, you’ll need to first buy the BDV-E580. This package includes a full 5.1-channel surround sound speaker setup, as well as a 3D Blu-ray player. Other features include built-in Wi-Fi and access to streaming services such as Netflix, YouTube, Hulu Plus, and more. It also has two HDMI inputs, an iPod/iPhone dock, a USB port, and support for Sony’s free Media Remote app.

Currently, the entire setup is on sale for $329.99, which is $120 off the list price. However, the discount and the free speaker offer will expire on December 3, 2011.